package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
            //1.获取request和response对象
            ServerHttpRequest request = exchange.getRequest();
            ServerHttpResponse response = exchange.getResponse();

            //2.判断是否是登录
            if(request.getURI().getPath().contains("/login")){
                //放行
                return chain.filter(exchange);
            }


            //3.获取token
            String token = request.getHeaders().getFirst("token");

            //4.判断token是否存在
            if(StringUtils.isBlank(token)){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //5.判断token是否有效
            try {
                Claims claimsBody = AppJwtUtil.getClaimsBody(token);
                //是否是过期
                int result = AppJwtUtil.verifyToken(claimsBody);
                if(result == 1 || result  == 2){
                    response.setStatusCode(HttpStatus.UNAUTHORIZED);
                    return response.setComplete();
                }
            }catch (Exception e){
                e.printStackTrace();
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //6.放行
            return chain.filter(exchange);
        }

        /**
         * 优先级设置  值越小  优先级越高
         * @return
         */

    @Override
    public int getOrder() {
        return 0;
    }
}
